Moreno-Gomez, Nicolas and Vargas, Edgar F. and Buchner, Richard (2022) Ionic effects on supramolecular hosts: solvation and counter-ion binding in polar media. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 24 (4). pp. 2040-2050. ISSN 1463-9076, 1463-9084
Full text not available from this repository. (Request a copy)Abstract
For the progress of synthetic supramolecular chemistry in aqueous solution the design of host molecules soluble in this medium is essential. A possible route is the introduction of ionic residues, with the additional advantage that also electrostatic interactions can be used to form supramolecular architectures. In this work we study the effect of different ionic substituents on a resorcin[4]arene host on solvation and counterion binding in water and dimethyl sulfoxide (DMSO). To do so, we combine dielectric relaxation spectroscopy (DRS) at 298.15 K and dilute-solution conductivity measurements covering 278.15-308.15 K. The results indicate that studied substituents lead to a comparable increase in solubility in both water and the dipolar-aprotic DMSO. However, solvation and counterion binding not only depend on the nature of the ionic substituent but also on the solvent. Although intrinsically hydrophobic in nature, resorcin[4]arenes with ionic substituents also show strong hydrophilic hydration in water, with the extent depending on the nature of the ionic group. In contrast to that, solvophobicity apparently dominates the interactions of DMSO with the solute. Counterion binding was found for both solvents and is essentially determined by solvent polarity. It appears that, compared to neat DMSO, the solubility of the cationic resorcin[4]arene with dimethylamine substituents is strongly increased in water-DMSO mixtures due to the formation of hydrogen bonds between two DMSO molecules and one water molecule.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MOLECULAR RECOGNITION; DIMETHYL-SULFOXIDE; DYNAMICS; GUEST; RELAXATION; ASSOCIATION; CONDUCTANCE; MIXTURES; CHLORIDE; DMSO |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 18 Aug 2022 05:14 |
| Last Modified: | 18 Aug 2022 05:14 |
| URI: | https://pred.uni-regensburg.de/id/eprint/46692 |
Actions (login required)
 |
View Item |
